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Title: BOUT++ nonlinear simulation for a comparative study with the measured 2D ELM structures in the KSTAR H-mode plasma

Abstract

Here, time-dependent nonlinear simulation using the BOUT++ 3-field model is performed for a study of edge localized mode (ELM) dynamics in KSTAR H-mode plasmas. The simulated results of the ELM evolution are directly compared with the 2D ELM structures, measured by electron cyclotron emission imaging systems, from the initial growth to crash phase. The simulation results are qualitatively in good agreement with the observations. Specifically, it is notable in simulation and experiment that higher-n modes in a quasi-steady state phase evolve into lower-n modes close to the ELM-crash in time. It indicates that lower-n modes may be responsible for the onset of the crash. A postanalysis confirms that nonlinear mode coupling between toroidal harmonics may drive the lower-n mode.

Authors:
ORCiD logo [1];  [2]; ORCiD logo [1]; ORCiD logo [3]; ORCiD logo [4];  [5]
  1. National Fusion Research Inst., Daejeon (South Korea)
  2. Ulsan National Inst. of Science and Technology (South Korea)
  3. Pohang Univ. of Science and Technology (South Korea)
  4. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  5. Alternative Energies and Atomic Energy Commission (CEA), Saint-Paul-Lez-Durance (France)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); National Research Foundation of Korea (NRF)
OSTI Identifier:
1568014
Report Number(s):
LLNL-JRNL-789212
Journal ID: ISSN 1070-664X; 987558
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 26; Journal Issue: 5; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Kim, M., Park, H. K., Lee, J., Yun, G. S., Xu, X. Q., and Bécoulet, M. BOUT++ nonlinear simulation for a comparative study with the measured 2D ELM structures in the KSTAR H-mode plasma. United States: N. p., 2019. Web. doi:10.1063/1.5085891.
Kim, M., Park, H. K., Lee, J., Yun, G. S., Xu, X. Q., & Bécoulet, M. BOUT++ nonlinear simulation for a comparative study with the measured 2D ELM structures in the KSTAR H-mode plasma. United States. doi:10.1063/1.5085891.
Kim, M., Park, H. K., Lee, J., Yun, G. S., Xu, X. Q., and Bécoulet, M. Wed . "BOUT++ nonlinear simulation for a comparative study with the measured 2D ELM structures in the KSTAR H-mode plasma". United States. doi:10.1063/1.5085891.
@article{osti_1568014,
title = {BOUT++ nonlinear simulation for a comparative study with the measured 2D ELM structures in the KSTAR H-mode plasma},
author = {Kim, M. and Park, H. K. and Lee, J. and Yun, G. S. and Xu, X. Q. and Bécoulet, M.},
abstractNote = {Here, time-dependent nonlinear simulation using the BOUT++ 3-field model is performed for a study of edge localized mode (ELM) dynamics in KSTAR H-mode plasmas. The simulated results of the ELM evolution are directly compared with the 2D ELM structures, measured by electron cyclotron emission imaging systems, from the initial growth to crash phase. The simulation results are qualitatively in good agreement with the observations. Specifically, it is notable in simulation and experiment that higher-n modes in a quasi-steady state phase evolve into lower-n modes close to the ELM-crash in time. It indicates that lower-n modes may be responsible for the onset of the crash. A postanalysis confirms that nonlinear mode coupling between toroidal harmonics may drive the lower-n mode.},
doi = {10.1063/1.5085891},
journal = {Physics of Plasmas},
number = 5,
volume = 26,
place = {United States},
year = {2019},
month = {5}
}

Journal Article:
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